A porous metal–organic framework formed by a V-shaped ligand and Zn(ii) ion with highly selective sensing for nitroaromatic explosives

Abstract

A V-shaped aromatic ligand 1,3-di(4-carboxyphenyl)benzene (H 2 DCPB), just retaining one branch of the H 6 TDCPB ligand, was utilized. The assembly of this ligand with Zn(II) ion forms a two-fold interpenetrated porous MOF with pcu topology . The N 2 adsorption isotherm of the activated sample at 77 K revealed a type-I microporous characteristic. The BET and Langmuir surface areas are calculated to be 503.7 m 2 g -1 and 718.9 m 2 g -1 , respectively. Notably, by fluorescence technique, JUC-10 135 can be used to detect nitroaromatic explosives. Especially, it is one of the most efficient porous material-based sensors for TNP (K SV = 3.7 × 10 4 M -1 ). Furthermore, JUC-135 also can distinguish TNP (blue-shift) from NB, 1, 3-DNB and 2, 4-DNT (red-shift) through shift direction of fluorescent spectra. 65 a 2θ range of 4-40° at room temperature. Thermogravimetric analyses (TGA) were performed with a Perkin-Elmer TGA thermogravimetric analyzer at a heating rate of 10 °C/min in the range of 30-800 °C under air flow for all measurements. Elemental analyses (C, H and N) were performed on a Perkin-70 Elmer 240 analyzer. Fourier-transform infrared spectra (FT-IR) Journal Name, [year], [vol], 00-00 | 3 65intensity of JUC-135 was reduced by 25.49%, 25.67%, 34.44%, 95.02% upon exposure to NB, 1, 3-DNB, 2, 4-DNT and TNP of 40 ppm, respectively (Fig. S6). The obtained data indicated that TNP is detected most effectively ( Fig. 4d and Fig. S5b-5d), which is mainly attributed to the three nitro groups in TNP. With 70 increasing -NO 2 groups, electron transfer becomes easier, which leads to more efficient fluorescence quenching. [56,57]

A Zn(ii)–organic cage with semirigid ligand for solvent-free cyanosilylation and inhibitory effect on ovarian cancer cell migration and invasion ability via regulating mi-RNA16 expression

“…According to Figure 1a, in the cage, Zn (II) ion is five-coordinated, which was completed by four oxygen atoms from four ligands along with an oxygen atom in the molecules of DMF or H 2 O, forming a trigonal bipyramid configuration. The bond spacing of Zn(II)-O varies from 1.923(17) to 2.143(6) Å, which are analogous to the distance observed in other Zn(II)-based metal-organic complexes constructed from the carboxylate ligands [19][20][21]. Two neighboring Zn(II) ions are linked through four carboxylic acid groups and form a fourlinked paddle-wheel node.…”

A luminescent metal–organic framework as an ideal chemosensor for nitroaromatic compounds

“…Due to their intriguing varieties of architectures, high surface areas, and tunable structures, MOFs have emerged as promising materials with a wide range of potential applications. Among them, luminescent MOFs, [6][7][8][9][10][11][12][13][14] as fast-growing organic-inorganic hybrid luminescent crystalline materials, have received signicant attention for the detection of hazardous substances because luminescent MOFs have the unique advantage of functional diversity. Luminescent MOFs are composed of two different parts: metal ions/clusters and organic bridging ligands, which can be considered as light-emitting sources.…”

The Importance of CH···X (X = O, π) Interaction of a New Mixed Ligand Cu(II) Coordination Polymer: Structure, Hirshfeld Surface and Theoretical Studies

“…In the final substructure, the 1-D parallel chain is juxtaposed through self-complementary C-H···π interactions. The carbon atom C (6) in the molecule at (x, y, z) acts as a donor to the π-cloud of the pyridine ring at (2 − x, 1/2 + y, 2 − z) ( Table 2); therefore generating a two-dimensional supramolecular self-assembled structure in (011) plane ( Figure 4). Consequently, this entire assembly as a whole produces a supramolecular combination of C-H···π interactions that illustrates the occurrence of a self-assembled two-dimensional supramolecular layered structure of a polymeric compound.…”

“…The rational design of CPs has increased significantly, owing to their fascinating structural architectures and their emerging application areas, including gas adsorption/separation, catalysis, magnetism, luminescence, sensors, etc. [6][7][8][9]. The most effective route to construct CPs is to use metal ions with mixed bridging ligands, especially with the bridging ligands containing O/N atoms [10][11][12].…”